Symlink icons (#1416) (#3826)

* Updated vendor code for code.gitea.io/git

* Display symlinks correctly for files and directories

* Added symlink tests

* Applied silverwinds stylesheet patch

Signed-off-by: Tris Forster <tris.git@shoddynet.org>

4 files changed, 56 insertions, 24 deletions

diff --git a/vendor/code.gitea.io/git/MAINTAINERS b/vendor/code.gitea.io/git/MAINTAINERS
index 4f3aab3183..8c8a4947dd 100644
--- a/vendor/code.gitea.io/git/MAINTAINERS
+++ b/vendor/code.gitea.io/git/MAINTAINERS
@@ -18,3 +18,4 @@ Antoine Girard <sapk@sapk.fr> (@sapk)
 Jonas Östanbäck <jonas.ostanback@gmail.com> (@cez81)
 David Schneiderbauer <dschneiderbauer@gmail.com> (@daviian)
 Peter Žeby <morlinest@gmail.com> (@morlinest)
+Jonas Franz <info@jonasfranz.software> (@JonasFranzDEV)
diff --git a/vendor/code.gitea.io/git/error.go b/vendor/code.gitea.io/git/error.go
index 4fd2a5b8fd..1aae5a37a2 100644
--- a/vendor/code.gitea.io/git/error.go
+++ b/vendor/code.gitea.io/git/error.go
@@ -40,6 +40,16 @@ func (err ErrNotExist) Error() string {
 	return fmt.Sprintf("object does not exist [id: %s, rel_path: %s]", err.ID, err.RelPath)
 }
 
+// ErrBadLink entry.FollowLink error
+type ErrBadLink struct {
+	Name    string
+	Message string
+}
+
+func (err ErrBadLink) Error() string {
+	return fmt.Sprintf("%s: %s", err.Name, err.Message)
+}
+
 // ErrUnsupportedVersion error when required git version not matched
 type ErrUnsupportedVersion struct {
 	Required string
diff --git a/vendor/code.gitea.io/git/sha1.go b/vendor/code.gitea.io/git/sha1.go
index 50708dee8b..6c9d53949d 100644
--- a/vendor/code.gitea.io/git/sha1.go
+++ b/vendor/code.gitea.io/git/sha1.go
@@ -5,6 +5,7 @@
 package git
 
 import (
+	"bytes"
 	"encoding/hex"
 	"fmt"
 	"strings"
@@ -26,43 +27,23 @@ func (id SHA1) Equal(s2 interface{}) bool {
 		}
 		return v == id.String()
 	case []byte:
-		if len(v) != 20 {
-			return false
-		}
-		for i, v := range v {
-			if id[i] != v {
-				return false
-			}
-		}
+		return bytes.Equal(v, id[:])
 	case SHA1:
-		for i, v := range v {
-			if id[i] != v {
-				return false
-			}
-		}
+		return v == id
 	default:
 		return false
 	}
-	return true
 }
 
 // String returns string (hex) representation of the Oid.
 func (id SHA1) String() string {
-	result := make([]byte, 0, 40)
-	hexvalues := []byte("0123456789abcdef")
-	for i := 0; i < 20; i++ {
-		result = append(result, hexvalues[id[i]>>4])
-		result = append(result, hexvalues[id[i]&0xf])
-	}
-	return string(result)
+	return hex.EncodeToString(id[:])
 }
 
 // MustID always creates a new SHA1 from a [20]byte array with no validation of input.
 func MustID(b []byte) SHA1 {
 	var id SHA1
-	for i := 0; i < 20; i++ {
-		id[i] = b[i]
-	}
+	copy(id[:], b)
 	return id
 }
 
diff --git a/vendor/code.gitea.io/git/tree_entry.go b/vendor/code.gitea.io/git/tree_entry.go
index 41023010cd..6201eef8fd 100644
--- a/vendor/code.gitea.io/git/tree_entry.go
+++ b/vendor/code.gitea.io/git/tree_entry.go
@@ -5,6 +5,7 @@
 package git
 
 import (
+	"io"
 	"sort"
 	"strconv"
 	"strings"
@@ -90,6 +91,45 @@ func (te *TreeEntry) Blob() *Blob {
 	}
 }
 
+// FollowLink returns the entry pointed to by a symlink
+func (te *TreeEntry) FollowLink() (*TreeEntry, error) {
+	if !te.IsLink() {
+		return nil, ErrBadLink{te.Name(), "not a symlink"}
+	}
+
+	// read the link
+	r, err := te.Blob().Data()
+	if err != nil {
+		return nil, err
+	}
+	buf := make([]byte, te.Size())
+	_, err = io.ReadFull(r, buf)
+	if err != nil {
+		return nil, err
+	}
+
+	lnk := string(buf)
+	t := te.ptree
+
+	// traverse up directories
+	for ; t != nil && strings.HasPrefix(lnk, "../"); lnk = lnk[3:] {
+		t = t.ptree
+	}
+
+	if t == nil {
+		return nil, ErrBadLink{te.Name(), "points outside of repo"}
+	}
+
+	target, err := t.GetTreeEntryByPath(lnk)
+	if err != nil {
+		if IsErrNotExist(err) {
+			return nil, ErrBadLink{te.Name(), "broken link"}
+		}
+		return nil, err
+	}
+	return target, nil
+}
+
 // GetSubJumpablePathName return the full path of subdirectory jumpable ( contains only one directory )
 func (te *TreeEntry) GetSubJumpablePathName() string {
 	if te.IsSubModule() || !te.IsDir() {